Full Version: Polygonal Converter.

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Hi Michael, I noticed some artifacts on surfaces in some cases, but I think there is a bugs in the code. Yesterday it was worse than now. :) I've already found and eliminated several bugs, but I'm sure that some bugs I missed.
I implemented this algorithm:
http://www.cise.ufl.edu/research/SurfLab/papers/10fan_sbs.pdf
I think it really can produce perfect surfaces

Yes, I thought about non-uniform refinement, and used it in previous version of this script. But I wasn't satisfied with results. So I will play for a while with this algorithm, but if I'll still have problems with it - I'll bring non-uniform surfaces back.
Here is example of non-uniform surfaces:
http://moi3d.com/forum/index.php?webtag=MOI&msg=7038.12

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Hi Max,

I was looking forward to see your update!!
Your examples look great, but i'm unable to replicate them.

It seems that the script only works on a primitive cube or extruded rectangle for me.?
Any thing drawn with a polygon line or booleaned solid either gives the error "unsupported polygon type! (2)" or the object just disappears.

Image Attachments:
subd error.jpg 

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Hi Glenn
This script doesn't support n-gons. Use triangles and quads.

I know about object disappearing bug. I'll take care of it.

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Subdiv beta 4 :)

Fixed some geometry bugs
Improved mesh load speed (about 10x)
Added support of polar triangles


Don't use any other types of triangles


Added handy feature: switch mode
If you use hotkey to run this script, put the same key combination as command parameter
Example: Key: Z Command: _Subdiv_beta4 Z
After that you can switch script on and off with Z key.

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Hi Max,

Thanks a lot for the update.

I have some really hard time to import anything a little bit complex
Here's for example what I get :

1290 Geometry error, 1290 recovered.



I'm not sure if it's something wrong with the .obj loader I use (the one coming from http://moi3d.com/forum/index.php?webtag=MOI&msg=6674.68 ) and if there is
anything you can 'do' to improve the loader. Looks like the loader have some trouble to deal with extreme non planar quads.

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I checked this model. There are many twisted non-planar quads in the obj. I'll think how to improve my importObj script for using it with such complex models.
The scripts works well with other complex models with non-planar quads .
for example:
http://www.craftsmanspace.com/free-3d-models/skull-3d-model.html
http://www.craftsmanspace.com/free-3d-models/piggy-bank-3d-model.html
http://www.craftsmanspace.com/free-3d-models/african-elephant-3d-model.html

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Hi Max,
_Subdiv_beta4 don't work for me on V3 MACSOX
I put the command _Subdiv_beta4 with Tab key but the panel Subdivision don't stay visible.
i've tested with skull and elephant
but in Moi if I put a solid Box and run the command _Subdiv_beta4, it's OK.
I think it's a matter of Mac and Memory.
Thanks

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Hi Max,

First thank you a lot for all the effort you did on this polygonal converter.
I have no idea of the complexity to write something like that, but I just want to point a general 'smoothing' problem with the method you are using. (and I'm not talking about surface continuity)

In the image :



A ) Max Sub-d : Low Quality
B ) Max Sub-d : High Quality
C ) Npower SubD-Nurbs.

My concern here is the wobble effect from the version B (Max Sub-d : High Quality).
This wobble effect is also visible on object silhouette. I know that I shouldn't compare your script to
a commercial 500$ product, but I'm wondering if it's something that might be improve in the future ?

In other words, while you manage to keep continuity between patches, it seems the side effect is an overall shape/silhouette deformation. It's something very obvious for polygonal surface subdivision people, used to see very smooth surface transition and ultra smooth overall silhouette. (catmull-clark)

Thanks.

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Hi PaQ,

Thank you for this valuable information. I have some ideas how to improve quality.

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Hi Max
any idea about my problem above ?
thanks.

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I tried -ImportObj- with Lisa-head from C4D


















Tried to join all surfaces but obviously take too much time
Obj file is 4 Mb,if saved in 3dm is 231 Mb

Image Attachments:
1.JPG  2.JPG  3.JPG 

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Hi Mauro,

> I tried -ImportObj- with Lisa-head from C4D

That looks very dense - is it a several times subdivided result that is being exported? If so then you want to try exporting the base level control mesh rather than already subdivided geometry.

- Michael

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Ciao Michael
Lisa comes from C4D content browser,she's already subdivided

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I joined small patches (much quicker) to few bigger patches and after all I joined all bigger patches into one solid. Much quicker than do it as one time consuming process (I used that for that bottle above). Maybe that helps.

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Hi Mauro,

just in case you need to recover her... ;-)

http://www.mariussilaghi.com/products/subd-recovery

Regards
Stefan

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Finema
>any idea about my problem above ?
Sorry, I don't have a mac. But it's very strange, it should work.

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Max,
I've tested all the example in this thread (and more) and none are running.
I've a 2 x 2,8 GHz Quad-Core Intel Xeon Mac Pro and 6 Go ram.
The Subdivision panel displays a split second and disappears.
No other Mac user had this problem ? It's curious...
Thanks...

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Hi, yes I am a mac user as well and when running the script I see a window flashing up on the left upper corner and that is it.

Maybe this will be resolved soon but anyway your work is awesome !!

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For me the subd script works well with MoI 2.52 (have not updated yet to 3.0) under OSX 10.8.5 with my old iMac.

Regards
Stefan

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Finema
Kroet

Check beta1 or beta2. Does it work?

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